The B-Spec coilovers were built by Eibach and I have a set on my car.
Eibach used my car to test a prototype setup
They are now only distributed in Europe as the laws are different here in the US and Eibach did not want to be sued.
Some people do bring them into the US but they were believed to be possibly unsafe.
The B-Spec rear coilovers are not supported on the top for full body weight except when using the internal roll cage as in the B-Spec car.
For this reason the rear springs were put back into the normal Fiesta location.
Here is a photo of my original setup.
Now I still have the same shocks but the springs with adjusters are in their normal FiST location.
Dave